Update README.md

Fix broken link

Closes #37886
https://github.com/dart-lang/sdk/pull/37886

GitOrigin-RevId: 82090798d28aef31c7aa73c001e7486d225c82d5
Change-Id: I53f2a1bb4fa2a5fb79870fa3f6351880c0b3f566
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113360
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
diff --git a/README.md b/README.md
index 288dac5..e0d4071 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@
 
 Dart is free and open source.
 
-See [LICENSE][license] and [PATENTS][patents].
+See [LICENSE][license] and [PATENT_GRANT][patent_grant].
 
 ## Using Dart
 
@@ -63,4 +63,4 @@
 [dartbug]: http://dartbug.com
 [contrib]: https://github.com/dart-lang/sdk/wiki/Contributing
 [pubsite]: https://pub.dev
-[patents]: https://github.com/dart-lang/sdk/blob/master/PATENTS
+[patent_grant]: https://github.com/dart-lang/sdk/blob/master/PATENT_GRANT